OK, my list of bugs I found:
About the water/Skybox meeting: WTF? Where the water meets the skybox, it looks horrible, no offense.
About the guns: What everyone else said.
About the Flags: The H2 flags look slightly different, I'm getting good at Flags, I can make and tag a perfect replica for you. Also, when you pick them up, it says "Picked up a Shotgun". This is a common error when using custom string lists, as you need to change the index for the flag, which hardly anyone does.
Finally, I have a syncing destructible vehicles script, just give me a list of what vehicles are in Headlong, and I can change the script to fit your needs.
But overall, good job.
EDIT: Also, you forgot the golden hog. Possible, but would require a long script. Here's how to get it (I've done it before, it works):
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