I agree with most of the reviews out there.
The zombie flick is fun with lots of humor.
The fake trailers separating the two movies are hilarious!
The first 1/3 of the car movie is very slow with lots of stylized dialog, but the ending makes it pay off.
If you have to take a bathroom break in the theater, do it at the start of the 2nd movie so you don't miss the fake trailers.
Lots of great cameos throughout, intersecting characters, and funny theatrical effects.
All in all, a lot of fun.
Don't see this if you are squeamish or easily offended.