I've watched a few of the episodes more than once. Okay, maybe more than a few. And everytime, I see something that would make a great "blooper." Here are a few that some friends and I came up with.

~Original Script

In Episode 6 (Party Night)-

Duo's hanging out on Howard's ship. He's lying on his Deathscythe, looking at the moon. Howard comes up beside the Deathscythe and says, "What's up, Duo?" Duo makes some comment about how long he'll get to see the moon like this. Well, here's what he should have said...

~New Script

Howard: Wassup, Duo?

Duo: Not much. Drinking some joe... watching the moon...

Howard: True, true...

~Original Script

In the episode where Septem dies (Episode 7: Scenario for Bloodshed)

Treize has just invited Septem to join him on his jet instead of getting sliced to pieces in the Alliance leader's jet. They're sitting inside Treize's jet, waiting to take off.

Septem: Why haven't we left yet?
Treize: We're waiting for the Alliance leader's jet to take off.

The new script would show Treize's attention to detail.

~New Script

Septem: Why haven't we left yet?
Treize: We're waiting for the peanuts to arrive.

~Original Script

Once again, episode 6.

The Wing saves St. Gabriel from destruction by OZ forces. There's one scene where the Wing is walking toward Relena. It would make an awesome screenshot. The Wing looks like it could step on Relena if it went far enough.

During filming (if Gundam Wing were filmed in front of a live audience :-), some wiseguy in the live audience could have a little fun.

~New Script

The Wing is walking threateningly toward Relena. Suddenly, a voice from offstage is heard over the dramatic music...

"KEEP WALKING, HEERO!"