When Stan and Steve are in the gift shop, they're standing in front of a display that clearly reads 'Handmade Wallets'. After a cut-away, they're in the same place but the writing on the display is illegible.
Stan tells Steve that the DeLorean's top speed was 88 mph. The DMC-12's speedometer only went to 85, but the car was actually able to go faster than that.
The license plate on the Delorean in Back To The Future read 'OUTATIME', and Stan's reads 'STNTYM' which are very similar, yet Stan mentioned that he never heard of the movie.
The terror level meter on the fridge has its colors out of order (blue, green, yellow, orange, red). The blue and green are switched.