Ricca is a fictional South Seas island. Judging by its population of 10,000, it must be a medium-sized island; Fiji and the Solomon Islands far eclipsed it in population at the time, while 10,000 was well above the populations of Easter Island or the Pitcairn Islands. The name may itself be an inside joke, since the artist here is Don Rico.
The trap is a rather clever twist on the dropping cage cliche, since this cage becomes portable.
This also means The Claw is at least a warlock (5th level magic-user).
Is a leach-boat going to need to become a trophy item? There's a pretty good description here of how it works.
Acetylene torches have been on the trophy list since Book II.
Gas masks, on the other hand, are super handy. Some Heroes build their whole personas around their gas masks. Here is a chance for Jerry to pick up five of them in one haul!
We also see that Jerry's potion lasts at least a full day here -- which seems like a really long duration, until you realize Jerry spent most of that in rest turns.
This trap, with liquid fire raining from the ceiling, looks like it would be pretty deadly if you don't happen to have an invulnerability potion in your system.
(Scans courtesy of Digital Comic Museum)