As the Columbo character started developing, we see recurring trademarks, jokes,etc.
Can play as a drinking game or i was also wondering which episodes features the most of these......
1. Talking to his dog or references to
2. Eating Chili
3. Reference to wife making an appearance but never shows for whatever reason.
4. Just "one more thing"... or popping back in when suspect thinks he's gone
5. Reference to the condition of his car
6. ____________________

Fumbling in his pockets for something important.

"Sir" or "Ma'am"

I just need to fill out my report you see, the captain oh he's a really stickler for details... you understand...

Sometimes other people's language falls into patterns too. One phrase I notice is "the subtlety of a train wreck" (Double Exposure, Double Shock, Most Dangerous Match).