Only the Lonely

Danny Muldoon

Rose Muldoon

Theresa Luna

Patrick Muldoon

Doyle

Spats

Nick Acropolis

Salvatore Buonarte

Johnny Luna

Father Strapovic

Billy Muldoon

Patrick Muldoon Jr.

O'Neal

Susan Muldoon

Larry

Jack

Duane Earl Tyrone (as John Chandler)

Chess Player

Cop

Cop

Waiter

Leo

Suit Salesman

Tuxedo Salesman

Tuxedo Salesman / News Vendor

Crazed Prisoner

Halloween Bum

Halloween Witch

Cop Friend

Policeman

Stewardess

Hoodlum (as Rick LeFevour)

Tommy Bones

Chicago Cop (uncredited)

Maureen O'Hara refused to sign the movie contract, though she loved the script, until she met co-star John Candy. Fortunately the two of them instantly created a strong rapport and she hastily signed on the dotted line.

This is the only John Hughes's film where he wasn't the writer.

Chris Columbus wrote the script with actress Maureen O'Hara in mind for the role of the mother. Once casting had begun, he insisted on having O'Hara play the role and began a search for her. What he didn't know was that she had long since retired and was living on St. Croix in the US Virgin Islands. Knowing her brother Charles B. Fitzsimons was still in the movie industry, Columbus contacted him and had a script sent. O'Hara's brother then sent the script to her and said, "This you do!" After reading the script herself, Maureen contacted her brother and said, "This I do!"

Danny: I'll pick you up at seven. Where do you live?

Danny: [to save time, Danny and Sal decide to transport a corpse out a sixth floor window via a fire hose but the hose turns out to be too short] I guess we have to bring him back up.

Rose: I was right. I still stand by what I said.