When in Rome - S1-E3
Revealing mistake: Will and Frankie are in a boat. In the first wide shot the boat is going rather slowly, in the next shot they are speeding many times faster, and the shot is erratic, showing that the action was speeded up. (00:02:05)
Revealing mistake: Multiple times when we see the speedometer of the minivan, the RPMs aren't moving. The car's shifter is also noticeably in park. This is obvious as its higher, whereas if were in drive, it would be lower. Even during the most intense moments, the RPMs never change. The car is obviously being towed by a camera vehicle.