You have to play as Big Daddy in the training mode to choose columbia as the stage and to put the "Infinite level 3 super" option ON. Then you have to use the Level 3 at the very beginning of the match and you'll se 2 guys swimming in the background... I've tried Big Daddy's level 3 somewhere else or at other points during the match in Columbia but this didn't happen again... Can someone manage to figure out who the two guys are?
If you use his level 3 on hades the patapon will be swimming in the background as well
This happens in quite a few stages If I remember correctly. If you do it in the San Francisco stage, you'll see Chimera swimming around in the background. I THINK you can see monkeys in the Time room/Invasion stage as well. Not sure about those, though.
I remember one time in Franze, my partner, who was using Sackboy, used his lv 3 and bubbles with music notes in them popped out! They weren't floating still in the air, they were moving around like that Mario Party mini game. I couldn't pop them and I don't know if it's an easter egg because I've never played LBP..
The music notes in bubbles float around during the whole match. It doesnt matter if you are sackboy or not
They are more than likely the Sweet Tooth henchmen that you see riding the rails at the begining of Columbia as someone has stated in a previous comment.
But didnt mention who those two on the rail were. I know they are Sweet Tooth followers because of the Twisted Metal mashup.
I believe it was Omar on a live stream who said, "the idea of why its Bioshock Infinite mixed with Twisted Metal is because they both share one thing, they have group followings trying to take over. Such as in Twisted Metal you have the gang of clowns who follow and support Sweet Tooth, and then you have the dolls who follow and support Dollface."
So my guess about the stage is the group of clowns and dolls are fighting for control of Columbia, just as in Bioshock Infinite two political groups will be fighting for control of Columbia.
And that's why I believe those are clown henchmen riding the rails at the begining of the Columbia intro
And I also believe those are who you see swimming in the background, but I have yet to see anyone swim, I have been too busy ramming people with Big Daddy's Lv 3 haha