Visible crew/equipment: During the car chase, when the taxi drives over the gas can and does the two wheel driving, you can see the ramp that flipped it up behind it. (01:01:25)
Other mistake: When they're walking on the Tri System, you can see the wrinkles in the fabric used to create the foggy background.
Character mistake: The ref says there's no rules before McClure fights Whiplash but she tries stopping them later.
Continuity mistake: Legionnaires are being mowed down left and right by enemy fire in a Nazi ambush. One of them falls into a road construction excavation. He falls on his back, but the close-up of his feet touching the power cable shows them facing down.
Revealing mistake: When Jake is driving his car to run down Vince, there is a quick shot just before he hits him that is obviously a dummy placed in front of the car.