Spoiler alert in case you watch the show and havent seen it yet.
There were a few pinballs in the episode (Big Fang Far... and a couple of EM's) Turns out the Bad guy collects rare pins and the rarest machine (Schoolgirl Reaper...aka Zingy Bingy, maybe?) is what the main character promises him to let the hostage go. This of course is a very simple synopsis of the episode but I find it very funny that someone on the writing staff must be a pinhead.