What does Lil want?

Inside GREASY LILS, Lil asks "HELLO SEYMOUR DUCK, WHAT CAN I DO FOR YOU?", then wants to know what Seymour will be using as money.
Nudge 1Where to look
She runs a café: she sells things. You need to pay.
Nudge 2A stronger push
Coins turn up in the game where a detective would look for clues. There's more than one of them.
Nudge 3Almost there
The coins are in a library, on a film set behind one of the maze's doors.
What you needOther problems to solve first
Solve these first (each opens its own page, no answers on the way):
Show the solutionThe whole answer, with a video
Bring a dollar piece (THE LIBRARY in Sherlock Bones has three: Rick says there's been a murder explains how to get there). Lil takes it and sells Seymour a banana buttie, "fresh made last week". There's also a studio key in her café: take it too.
Why it works
Lil's script looks for any of the three dollar pieces in the inventory and places the banana buttie in exchange. Somebody very big on another film set is very hungry.