At the scene where Kelly's Mom having sex with some guy (where Kelly's School calls and says "your son/daughter was not in school"), just after that Kelly breaks down in tears, and she says "I miss dad" and mom says "I do too, sometimes." Later she says, "He didn't HAVE to kill himself, Kelly."
Later on, when he goes to George's to have lunch with Sandra and finds out he can't park it... moments later, some man comes out and tells the guy to park his car, and in the midst of conversation with Sam tells him "If I ever find you around my daughter again," insinuating that that man was her father. How did he get there when he already committed suicide?