Two bugs to report here with season 5
In my game while playing shyvana my scavenger smite ability was not triggering its bonus on many occasions despite the monster being low enough to die from it. The was no bonus gold or movespeed and the cooldown was not reduced. I suspect it had to do with my burnout ability damaging the monster at the same time as i was smiting (damage from burnout took precedence over smite and was counted as being the killing blow). This is a bug that must be fixed immediately or else junglers are sure to suffer.
Second bug was one that occurred upon spawning in on summoners rift. I loaded the game just like I would with any and when I spawned in on the rift, only I didnt and nobody else did either. I was watching a summoners rift with no champions and I was unable to issue move orders, cast abilities, or purchase items (however I was able to level an ability). The issue resolved itself when I quit and reloaded the game however this put me far behind my opponent.
I would also like to point out that I have been experiencing an increased number of bug splat errors within the past month (I use the mac client).