When this short aired on ABC, the aftermath of the explosion from the dynamite in the birdcage, Sylvester staggering down the stairs, was removed. Also, when Sylvester pulls on the cork of Tweety's Hopalong Cassidy gun, it was partially edited to remove him receiving real gun discharge.
On both Cartoon Network and the defunct WB station, the entire scene with Sylvester as an Indian and Tweety as Cassidy was removed.
Source: The Censored Cartoons Page