Mr. Rowe (Robert Culp) in College, when he said something along the lines of, "You're going noplace in this case due to incompetency. I'm not stating an opinion it's just that facts are facts."
Columbo saying that General Hollister is vain, and Suzanne Pleschette's character responds, "Lieutenant, some men do not want to look like an unmade bed."
Also Col. Rumford gesturing to Columbo's coat and saying, "Well, I guess you could call that a uniform."