Cat on a Hot Steel Beam - S1-E60
Continuity mistake: When Mindy is about to walk off the far end of a steel beam on the 90th floor, Buttons extends the beam by bolting on a wooden plank. As the shots change, so does the side on which the plank is bolted.
Cat on a Hot Steel Beam - S1-E60
Continuity mistake: After Mindy escapes from her backyard to chase a black cat, the gate hook vanishes from the fence post as soon as Buttons notices that Mindy is gone.
Cat on a Hot Steel Beam - S1-E60
Character mistake: As the fire truck darts out from a back alley, the sign on a nearby gift shop window reads "gift's" when it should be "gifts".
Cat on a Hot Steel Beam - S1-E60
Continuity mistake: In the opening scene where Mindy escapes from the backyard's gate, Buttons naturally runs out to find her. But at some point in this short time, the gate's hinges switch sides.