hi mo
this is a scene where columbo is in a restaurant/bar and he is watching the tv, and donner is sitting next to him. donner keeps interrupting columbo as he is trying to watch the news report. and then columbo asks him if it rained last tuesday, and he doesn't remember.
He probably went over to do a part on the McCloud set in the same studio. He was an inconsequential character to the plot anyway, but Columbo does interview them all in the office later on.
And Robert Donner appears in a few Columbo epsiodes, but I'll always remember him best for his role on Mork and Mindy. Incidentally, he died last month.