Continuity mistake: When Cleopatra and Caesar meet for the first time, Caesar takes a piece of fruit to his mouth. But in the next shot, his arm is by his side even though there was no time for him to put it down. (00:22:15)
Continuity mistake: When PT 109 crashes into the hut at the end of the wharf it is doing about three knots. The shot before (across the stern) shows the wake of a boat doing about 35 knots. When the boat actually hits, a sailor falls over, the wrong way for someone caught by inertia and at the same time, on the port stern bollard, you can see a line fastened and leading ashore. The boat is supposed to be moving alongside the wharf off to starboard: (a) there is nowhere for that line to be fastened to, and (b) the boat is supposed to be still underway.