Tom Kennedy is menacing Bert Lahr because he threw an oil-soaked hat in his face. Pat O'Brien intervenes and punches oil-smudged Tom Kennedy in the stomach. Pat's cheeks are clean. Cut to Tom doubling over. Cut back to Pat with an oil smudge on his right cheek, even though Tom never touched him. Bert enters the shot offering Pat a hammer. Pat says "That's all right." Cut to long shot of Tom retreating and Pat wiping his face. No smudge in next close-up. So it appears there was more to the fight, but it was edited out.
During the slapstick scene when they are ascending uncontrollably the shots of the altimeter have it going down.