Plot hole: The scheme to lead a blindfolded Max and 99 to what they think is the airport via an illusion room would not work the way they do it. Since the base is underground, there is no way that what they did to represent ascending to ground level that would make a person think they were above ground.
Get Smart (1965)
1 plot hole in Supersonic Boom
Starring: Barbara Feldon, Don Adams, Edward Platt, Robert Karvelas
Continuity mistake: When Max is phoning the Chief to let him know the mission's been accomplished, he takes the oars out of the oarlocks before opening his shoephone. The oars change from being out of the oarlocks in the closeups to still being in the water in the long shots for the rest of the episode. (00:23:50 - 00:24:30)
School Days - S1-E3
Max: When the moon is full, the tide is high.
Old Lady: You must want the spy school, that's next door.
More trivia for Get Smart