Continuity mistake: When Michael Jackson returns to Purgatory, keep an eye on Patrick Swayze. He is sitting on the left hand side of the front row. He's wearing the exact same black shirt and pants he was wearing in Dirty Dancing including the same hairstyle. About 2 shots later, his hairstyle has changed and he is now wearing a black fleece with a grey shirt and a lighter grey pants. Another 2 shots later, he is now back to the Dirty Dancing hairstyle as well as the Dirty Dancing clothes. Then when the Purgatory plane leaves, he is now wearing the other black fleece and grey shirt and lighter grey pants. Then when the Purgatory plane lands in Hell and the flight attendant says "All right, everyone, I'd like to be the first to welcome you to the gates of Hell. Unfortunately, Hell is a tow-in gate" and everyone shouts "AWWWW!", we can see Patrick Swayze has now gone back to the Dirty Dancing hairstyle and clothes.
Other mistake: When the guys play Lady Gaga's "Poker Face" on Rock Band 2, there are a few problems. The TV screen shows 4 people playing (the guitar, bass, drums, and vocals) when actually 3 people are playing, the TV repeats itself on a constant loop, and there are no lyrics on the screen shown. Also the drums go from right to left: blue, yellow, red, and green. The drums are supposed to go red, yellow, blue, and green.