The Keys Stopped the Music When They Hung On The Nail
I bought the two episodes, Cleaning the Clubhouse and Most Amazing Watch, off Ebay.
The first one is listed as having aired in '61 and the second in '68, but I wouldn't be surprised if the second one is older.
The captain does look somewhat bigger in the second one, so it may have taken seven years for him to get big like that.
I remember the show before I started school and either this was a bad episode, or it is older, as the Captain I remember was just a wee bit better structured than this, plus I can't believe the set changed so much to when I was able to recognize and remember things, but I may be wrong.
Anyway, the Captain would enter with the ring of keys and hang them on a nail. The theme music would suddenly stop.
This was the '61 episode.
The slant seems to be the music would stop when he hung up the keys.
I remember this! It went for a while.
In the '61 episode, two clowns can't clean the clubhouse cuz they keep dancing, so the Captain gets rid of the record player and the radio so they can't have anymore music.
The clowns move the keys and the music starts playing.