The Zenigame flag had the ze (ゼ) painted out in the dub version.

The scene right after the Zenigame flag also featured a Bank sign with Japanese currency yen symbol (¥) beside it. The yen symbol was painted out in the dub version.

An obvious change to make the dub less violent and threatening was the scene where the Zenigame Gang tell Satoshi that Kasumi would be executed the next day by noon if he didn't return on time.

English Dub
Meowth: The Squirtle says that if you're not back here by noon tomorrow the red-headed girl gets her hair dyed purple.
Misty: Purple!? Why you mangy little flea trap. When I get out of this I'm gonna wrap your tail around your...

Japanese Translation
Nyarth: It says if you don't return by tomorrow at noon, this woman will be executed.
Kasumi: Why am I being executed? That's no good, let me be the one to go!

Near the end of the episode, the Zenigame Gang receive coats with ze (ゼ) embroidered on the back which was also painted out in the dub.

The scene right after the Zenigame Gang received their coats also features another flag with ze (ゼ) which was painted out.

The original version neglects to credit Rikako Aikawa (愛河里花子), who played the Zenigame Gang leader.