There are several, so I'll put them all here.
1) There are 2 back buttons, one on the left (arrow pointing left), and another on the right which looks like the back button on the single player result screen.
EDIT: 1 is duplicate.
2) When the song is over there is a chance that the game will glitch, spawning tons of hit circles, starving your hp, followed by failing and jumping to the multiplayer screen, skipping the results screen.
3) I had claims that when I failed on my side, the hp bar jumped from full to 0 on other players' side. And by jumped I mean, there wasn't crazy hp drain such that you should see it go down for about a second.
osu! version: 20150305 (latest)
EDIT: 1 is duplicate.
2) When the song is over there is a chance that the game will glitch, spawning tons of hit circles, starving your hp, followed by failing and jumping to the multiplayer screen, skipping the results screen.
3) I had claims that when I failed on my side, the hp bar jumped from full to 0 on other players' side. And by jumped I mean, there wasn't crazy hp drain such that you should see it go down for about a second.
osu! version: 20150305 (latest)