The ones I can't get:
#44 - the fire truck
#50 - old dude missing an eye
#32 - crowned owl
#36 - broken clock
#33 - R at a computer
#34 - '& Rocket
#25 - tiger chopper
#29 - running rock dude
#40 - wasp with gem
#55 - pink car
#27 - cobra soup
#18 - gold T
#08 - book with bull/ram
#14 - guy with broom
#15 - skull face
#23 - violin cross
#16 - star dude
#21 - megaman?
I think it times out after a while, because I stopped for a bit when I was at 27 or so, and when I started later I couldn't get any more right. I refreshed the game and some of the same answers worked after that. So if it seems like you figured one out but can't get it, try refreshing and entering it again. But you'll have to enter all the other answers again too.