During Colton's helicopter training scene, it was in a Bell 47 but, several clips were from the Alouette (one used for the breakout).
When Hawkins (Quaid) is painting the helicopter, the pilot storms in yelling what is going on. The scene cuts to Colton (Bronson), then back to the helicopter which now has less painted area than before.
In the helicopter training scene, Charles Bronson is suddenly wearing sunglasses when less than a second before he was not.
A clock in the prison has a second hand which only moves in between shots.
The airport that Nick flies out of is located in Texas, but the surrounding countryside is covered with Joshua trees, which are only found in the Mohave desert of Southern Calif, the Southern tip of Nevada and Northwestern area of Arizona.