Burl Ross (Little Bunny Foo Foo) and Renee Margolin (Sillywhim) are the only actors to reprise their roles from the original Wee Sing videos.
If you look closely at the game board, you can also see Melody Mouse and Hum Bear (from Wee Sing Together), Old King Cole and Humpty Dumpty (from King Cole's Party), Dutch Girl (also from Grandpa's Magical Toys), Poofer and Gusty (from The Best Christmas Ever), Andy Bandy Man and Hatrack (from The Marvelous Musical Mansion, the latter also played by Burl Ross), Farmer Fran (also from The Wee Sing Train and is mentioned by Tim when he misses her) and Stella Starfish (also from Under The Sea), but they don't attend the Wee Sing Festival. Also, Wee Sing Together, King Cole's Party, The Best Christmas Ever and The Marvelous Musical Mansion are the only videos not to have a representative and The Big Rock Candy Mountains is the only video to have two representatives: Little Bunny Foo Foo and the Snoodle-Doodles (the latter counting as one, as mentioned by Annie).
This, Wee Sing: Classic Songs for Kids (1996) and Wee Sing: Animal Songs (1996) was exclusively released on VHS by MCA/Universal Home Video, and was not released on DVD by Wee Sing Productions.