When Barry and Norm are boxing, Norm is seen getting head gear put on. After Barry has Norm in the corner and backs back, Norm no longer has the head gear on. It is clear that Norm would have had no time to have the gear removed between the camera shots.
When Ray tells Darcy to, "Put it away, son", Darcy is leaning against a car. In the next shot, made out to be in real time, Darcy is standing away from that same car.
Tony and Sal are flying to Sydney when Sal looks down and sees Hawaii as they fly over. Tony tells Sal that it will be another 6 hours until they get there. However, even today, the flight time from Honolulu to Sydney is about 10-11 hours.
In the scene where Tony is showing Barry the "Liberty" video slot machine, such technology as relatively high resolution color video, synthesized audio and computer power to animate the images was not available in video slot machines until the 1980's and not mainstream in video slot machines until the 1990's.
In the car chase with Freddie, a 1990s Mitsubishi Magna can briefly be seen in the background.