Ralph Foody who was the gangster in the Home Alone movies Kevin watches is the homeless man in Curly Sue who steals the ring and sells it to the pawn shop. He says "Thanks you jerk" to the clerk which he says in the Home Alone Movies.
When the snooty maitre d' tells Curly Sue he wants to kiss her on the cheek, she uses the idiomatic expression "in a pig's eye," meaning extreme disbelief. Pigs' eyes are very small and unrevealing. Although the expression was first used in print by a British Poet, Richard Flecknoe, ironically the idiom is only common in the U.S. and Australia. It first came to use in the U.S. in the 19th century, and is unknown in the U.K. A variant expression is "in a pig's ear."