I'm not sure if its a bug or a feature so I'll call it an annoyance.
In the second act of 303 (Museum bits) there is a looping rain sfx that repeates for 5-6 seconds, stops for one second and then starts again. Basicly, its woooooooooooooooosh... *nothing* woooooooooosh....
And personally I found it very annoying XD
Maybe it was just me.
Rest of the episode, so far since I'm still not done, has been quite bug free. Except for Sal.