Johnny tells Ali he's driving a 93 Dodge Caravan, however the minivan stolen by Robby from Daniel's lot driven now by Johnny is actually a 1996-2000 3rd generation Caravan.
When Johnny and Kreese fight, a stunt double is used for Kreese: in the behind shots, Kreese looks younger and his hair is brown with no gray.
When Daniel and Ali are saying their goodbyes at the country club (starting at Ali saying "We were so young..."), it is obvious the special effects people have "smoothed out" Elisabeth Shue's neck. There is a dark line all around her jaw and her 57-year-old neck is all one shade of color.
While the prisoners are in the cage as the bombs are going off, one of the actors pulls a small section of bar on the supposed metal cage off and frantically tries putting it back in the same shot. The next shot shows it securely back in place. This section is right above the cage door.