So I've posted on this learning project a few times now and I'm stuck again. I have two ways to rent a movie, a movie specific button created dynamically in the table and also a checkbox is available for each movie with a rent all checked movies button at the bottom.

I'm having a hard time with my code to keep track of the checked movies. Please let me know if you have any suggestions on how I could improve this or what I could use in the PageReference AddSelected. Am I making it more complicated than it has to be? 

public class RentalController {

   public List<Movie__c> movieList {get; set;}   
   
   public Movie__c movieToRent {get;set;}      
   
   public string movieIndex {get;set;}
   
   public Rentals__c newRentalRecord {get;set;}
   
   public string movieChecked {get;set;}
     
   List<Movie__c> checkedMovieList = new List<Movie__c>();
   
   // Used onClick for each movie checkbox
   public pageReference AddSelected () {
      for (Movie__c tempMovie : checkedMovieList) {
          if (tempMovie.ID==movieChecked) {
            // WRONG SYNTAX BELOW? NEED TO REMOVE MOVIE IF ALREADY WAS SELECTED BECAUSE ITS NOW BEING DESELECTED   
            //  checkedMovieList.remove(tempMovie);
          }
      }
      checkedMovieList.add([SELECT ID, name, description__c, price__c, total_inventory__c FROM Movie__c WHERE ID=:movieChecked]);
      return null;
   }   
      
   public RentalController () {
       movieList = [SELECT ID, name, description__c, price__c, total_inventory__c FROM Movie__c LIMIT 20];
   }
   
   // Used when Rental all Checked Movies button is selected
   public PageReference rentAllChecked () {
     Rentals__c newRentalRecord = new Rentals__c();
     insert newRentalRecord;
              
     for (movie__c tempMovieToRent : checkedMovieList) {
         tempMovieToRent.total_inventory__c=tempMovieToRent.total_inventory__c-1;
         update tempMovieToRent;         
         // Create new Unit Rental Record and Insert
         Unit_Rental__c newUnitRentalRecord = new Unit_Rental__c();
         newUnitRentalRecord.Movie__c =  tempMovieToRent.ID;
         newUnitRentalRecord.Rental__c = newRentalRecord.ID;   
         insert newUnitRentalRecord;               
     }
      
     // Redirect to Success page passing rental record ID
     PageReference p = Page.RentalSuccess;
     p.getParameters().put('id', newRentalRecord.ID);
     p.setRedirect(true);
     return p; 
   }
   
   // Used when movie specific rental button is selected
   public PageReference rent() {
       // Query matching movie ID and assign as selected movie object
       movieToRent=[SELECT ID, name, total_inventory__c, price__c FROM Movie__C WHERE ID=:movieIndex];
   
       // Decrement movie inventory by 1
       movieToRent.total_inventory__c=movieToRent.total_inventory__c-1;
       update movieToRent;
       
       System.debug(movieToRent.name); //SUCCESS
       
       // Create new Rental Record and Insert
       Rentals__c newRentalRecord = new Rentals__c();
       insert newRentalRecord;
       
       // Create new Unit Rental Record and Insert 
       Unit_Rental__c newUnitRentalRecord = new Unit_Rental__c();
       newUnitRentalRecord.Movie__c = movieToRent.ID;
       newUnitRentalRecord.Rental__c = newRentalRecord.ID;
       insert newUnitRentalRecord;
       
       // convert price to a string, should create seperate method for this
       string price;
       price= movieToRent.price__c.format();
       
       // Redirect to Success page passing movie name
       PageReference p = Page.RentalSuccess;
       p.getParameters().put('id', movieToRent.name);
       p.getParameters().put('price', price);
       p.setRedirect(true);
       return p;
    }        
}

<apex:page controller="RentalController"   >
 <h1>Rent a Movie</h1><br/><br/>
 <h2>Please Pick movie(s) to rent:</h2>
 <apex:form >
 <apex:pageBlock >
     <apex:pageBlockTable value="{!movieList}" var="movie_item" id="rentalTable">
         <apex:column headerValue="Movie Title">
             <apex:inputCheckbox id="movieChecked">
                 <apex:actionSupport event="onclick" action="{!AddSelected}" rerender="rentAllChecked">
                     <apex:param name="movieChecked" value="{!movie_item.ID}" assignTo="{!movieChecked}" />
                 </apex:actionSupport>
                
             </apex:inputCheckbox>
             <apex:outputText value="{!movie_item.name}"/>
         </apex:column>
         <apex:column headerValue="Description">
             <apex:outputText value="{!movie_item.Description__c}"/>
         </apex:column>
         <apex:column headerValue="Price">
             <apex:outputText value="${!movie_item.Price__c}"/>
         </apex:column>
         <apex:column headerValue="# In Stock">
             <apex:outputText value="{!movie_item.Total_Inventory__c}"/>
         </apex:column>
         <apex:column headerValue="Rent It">
             <apex:commandButton value="Rent {!movie_item.name}" action="{!rent}" rerender="rentalTable">             
             <apex:param name="movieIndex" value="{!movie_item.ID}" assignTo="{!movieIndex}" />
             </apex:commandButton>
         </apex:column>
     </apex:pageBlockTable><br/>
     <apex:commandButton id="rentAllChecked" value="Rent all Checked Movies" action="{!rentAllChecked}" rerender="rentalTable">             
         <!--<apex:param name="movieIndex" value="{!movie_item.ID}" assignTo="{!movieIndex}" />-->
     </apex:commandButton>  
 </apex:pageBlock>
 </apex:form>
</apex:page>