The establishing shot for the first scenes in the bowling alley shows the exterior sign of the Times Square Bowling Lanes at 7th Avenue and West 43 Street, New York City.
The bit with Oscar spraying the dining room table around Felix's dish was taken from the original stage play.
As Felix is bowling for the win you can see a wedding ring on Tony's left hand.
Jack Klugman accidentally sprays Al Molinaro with beer while popping open a can and Al just wipes his shirt.
In yet another instance of something naughty being hidden in plain sight in an 'Odd Couple' episode, when Oscar and Felix are talking in Felix's room, Felix/Tony Randall is clearly giving the middle finger as he scratches his face.