When Oscar and Murray (Jack Klugman and Al Molinaro) are watching the horse race, the clip they show is the same one used in the 5th episode of this season, "A Grave for Felix".
At the Japanese restaurant in which they are co-investing their money, Felix introduces Oscar to the restaurant's owner, his old friend, Mr Yamada. Every reference to this character is clearly "Mr Yamada" or "Yamada-san". In the end credits, however, Pat Morita's character is listed as Mr Wing.