"Oscar's Birthday"

Felix’s attempts to throw Oscar a surprise party is the plot of “Oscar’s Birthday” (S3E10) which is the topic of this week’s episode.  We get into such details as: 1) Why the production started to use a building other than the real 1049 Park Avenue for exterior shots 2) the first of two appearances of Monroe - the super’s son and the actor who played him 3) speculation that Felix and Miriam seemed to have a platonic relationship instead of a romantic one 4) Oscar has a brother?!?!