Are there any allusions in Wuthering Heights?

"It's a cuckoo's, sir...And Hareton has been cast out like an unfledged dunnock" (41).

"'Rough as a saw-edge, and hard as whinstone! The less you meddle with him the better" (41).

"What vain weathercocks we are" (38).

"We were quarrelling like cats about you" (129).