Spot The Difference - Challenge 4

[Mistery]

Another spot the difference game by 123bee. Good luck

Play Here

Please use spoilers to give hints:
[spoiler=Title Here]Enter text here...[/spoiler]

[old biker]

number 136 on world ranking

[elle]

This one is very strenuous to the eyes!

[Smidget]

Ugh...just can't find them all in level 3!
OK, one more try...