Look through the knothole of the wooden fence next to the Quickie Mart to get a Police Quest reference.
Look at the park to get a reference to Space Quest and Coarsegold.
Have a seat, Mr. and Mrs. Williams
When Larry waits to get a seat at the restaurant, the receptionist first lets all the rich people pass and take a seat, including Mr. and Mrs. Gates (referring to Bill Gates of Microsoft) and Mr. and Mrs. Williams, referring to Ken and Roberta Williams, founders of Sierra On-Line.
Rosella the hairdresser
Many barbers in Larry 2, 5 all together, but the one at the airport surely has ended up in the wrong game series. Never trust princess Rosella of King's Quest IV to give you a haircut. SHE is supposed to have the nicest long blond hair, not Larry (duh!)