Continuity mistake: During the 'High Adventure' skit, the Frenchman leans over and kisses the interviewer on the right side of his face, in the next shot however it shows him kissing him on the nose and not enough time had elapsed between shots for this to have happened.
Continuity mistake: During the 'High Adventure' skit, the interviewer dies of a heart attack and is leaning back on the chair, in the next shot he is now leaning forward.
Continuity mistake: During the theatre scene, the usher puts a knife to the man's throat, in the next scene however, the man's head has now moved to the right and there was not enough time between shots for this to have occurred.
Answer: Detroit has long been notorious for its high crime, high unemployment, and urban blight. It's just a joke about how it's not a very pleasant place to be. Heck, the city motto is 'We hope for better things' and 'It will rise from the ashes.'
Brian Katcher