Polly the eel was created as a loan shark to let Oscar bring him 5,000 Clams to the seahorse race, but the filmmakers felt like that Polly's inclusion would make the film confusing. Instead, they put his traits into Sykes.
Trivia[]
Polly was intended as the secondary antagonist but was replaced by Sykes.
Dennis Hopper were deleted a role of Polly the Eel.
Christopher Walken (the role of Luca the Octopus), John Lithgow (the role of Willie the Killer Whale), George Segal (the role of Willie the Killer Whale), Alan Rickman (the role of Willie the Killer Whale), Leonard Nimoy (the role of Willie the Killer Whale), Omar Sharif (the role of Willie the Killer Whale), Leslie Nielsen, David Bailie, Bruce Kirby, Randy Savage (the role of Willie the Killer Whale), Gordon Tootoosis (the role of Willie the Killer Whale), Tony Jay (the role of Willie the Killer Whale), Michael Pataki, Geoffrey Lewis, John Davis Chandler, Daniel von Bargen (the role of Willie the Killer Whale) and Frank McRae were considered for the role of Polly the Eel.