Well, there're a few glitches that are not a reason for ban but they give some advantage.
The first one is
Advance Marauder one-zap kill which happens on a little more stressed servers when you zap only single naked human. The glitch is caused by imperfect server timing and rounding of zap damage resulting in 100hp damage dealt instead of 80hp you should deal to a naked human.
The second glitch is
inability to toggle items when you completely run out of ammo. It's caused by forgotten flag so the game thinks you're still shooting while it's not true. And since you can't toggle items while shooting, you have only 25% chance your toggle will work (there's a small time window once every 4 server frames when the weapon timer is <= 0 and you can toggle something). This one can be really nasty.
The third glitch is the "turret in a box" bug. When you build a building very close to some obstacle, the model might draw below the actual hitbox so there's an invisible barrier above the model and attacking the model does not make any damage to the structure.
All those 3 bugs are fixed in SVN and I suggest that server admins who still run 1.1.0 Tremulous server only with the essential security/crash patches should consider updating the server.