I agree with signals and astone2665....number of possiblities including inconsistent performance from a tired and somewhat marginalized optical drive.
In an effort to isolate the causes(s) of your problems please try the following:
Rip The Illusionist +/or The Devil Wears Prada to your hdd, not a blank disc (ie., source=original disc, target=hdd).
Are the errors reproducible on playback from your hdd?
(please give specifics, ie., freezing, pixelation, etc., as signals suggested).
Do you have access to another burner?
If you don't have Nero CD-DVD Speed, please click on the link in my sig and dl/install. It's free and a very useful little utility.
There are a number of tests that would be helpful here.
"Benchmark": Used to test an optical drive and/or burned media.
There are a number of subtests included in benchmark.
"Create Disc": Essentially a writing test.
"Disc Quality": A test of burned media, but can be used with pressed media.
Note: not all burners are capable of performing this test.