By Bruce Fretts
Updated February 16, 2001 at 05:00 AM EST

Not since Brian Helgeland cowrote 1997’s L.A. Confidential and The Postman has a single writer toiled on the year’s best and worst scripts. Kenneth Lonergan duplicated that dubious feat by penning both the terrific You Can Count on Me and this painfully flat adaptation of the ’60s moose-and-squirrel cartoon, with De Niro embarrassing himself as Fearless Leader, the evil mastermind behind Really Bad TV. After suffering through this fiasco, you’ll swear the company launched a film division. D