In one scene where Haskell talks on his car phone, he is wearing sunglasses, a lavender shirt, and a purple tie. After a brief cutaway, he is wearing eyeglasses, a dark blue shirt, and an orange tie (and while he had the earpiece up to his ear in the earlier shot, he now seems to be talking to a speaker-phone). Later on (that same day), he has returned to wearing the lavender shirt and purple tie.
The Mercedes S-Class shown tumbling down the hill is (at least) one generation older than the model that Haskell drives until that point in the film.
About 5 minutes into the film, there is a long dialog between Caine & Fox. Caine is wearing sunglasses and the reflection shows a crew member standing several feet away, not Fox.