The spectral analyzer in the geology lab is the oscillation overthruster prop from "Buckaroo". This was an homage to the film by the art department.
Doctor Crusher mentions Doctor Pulaski's memory operation
Picard discusses the tectonics of Drema IV
Starfleet personnel question the Prime Directive when there is a chance to save doomed people who otherwise would all perish. Picard's views are surprisingly inconsistent between the two episodes.