Okay... here's the solution to fixing the screen ratio problem.
You could do the above (as stated by LucasM)... but if your player lacks the capability or you just want things right!! Then here you go.
Download a freeware program PGCedit.
http://download.videohelp.com/r0lZ/pgcedit/pgcedit_winexe.zipYou will need to copy all files from your Planet of Dinosaurs DVD to your hard drive. DVD Decrypter should work nicely. Now you will have a bunch of IFO, VOBS and BUP files in a directory.
RUn PGCEdit and Click the "Open DVD" icon or hit Shortcut "Control key + O"
Select your directory were the ripped files are and click Open.
A pop up title "Find BOVs" will appear. Just ignore it and click "Close"
On your left you will see a bunch of lines items starting with "VMG" Find all lines that have the word "Title" at the end. (Title M, Title 1, and Title 2)
Right click on each of these line items one at a time and click "Domain Stream Attributes".
Click the radio button for "16x9" (which deselects "4x3"). Cilck "OK". Do this for all the title line items.
Click the "Save DVD" icon or hit "Control key + S"
It should now say "DVD Saved OK!"
Now just burn all your files on a new DVD with your favorite burning software and your good to go!
Its surprising to see this problem. Hopefully the rifftrax guys will see this and at least fix the ISO file for everyone!!