17 Again (2009) - 5 major mistakes

Continuity: After Mike and Ned fight with lightsabers, when they are in the kitchen Mike's wedding ring moves from his left hand to his right hand and back again, between shots.

Visible crew/equipment: Before the start of the last basketball game, when Ned calls out, "Jane!" for the third time in the shot facing him as he tries to pass someone, the actors' green T-mark and three other tape marks - one yellow and two red - are visible on the floor ahead of Ned. (Visible on DVD fullscreen.)

Continuity: When Mike walks into Health class, Mrs. Dell's lectern and stool (upon which the basket of condoms and another basket sit) stand directly in front of the chalkboard, but funny how they are both conveniently gone when Mike knocks Stan to the floor, in front of that chalkboard.

Continuity: On the bridge, when Mike topples into the water headfirst, the distinctive treads on the heels/soles of his shoes, as well as the light colored brand logo on the heels, are visible. After the newly transformed Mike appears at Ned's home wearing the same clothing, when Ned pulls the rug out from under Mike, his shoes' soles are completely different.

Visible crew/equipment: In the opening shot of Ned and Mike in the kitchen, with frozen veggie ice-packs on their assorted injuries, just before it cuts to Ned staring at Mike, the actor's orange tape mark is visible under his feet as he is sitting on the stool. (Visible on DVD fullscreen.)