The title is from the American game show where a panel must guess which of the three contestants is telling the truth about their unusual occupation or experience.
Donny's information about Maris' fortune being derived from urinal cakes is in a yellow folder.
When Donny has the brothers come over to listen to the phone call with Maris' lawyer, Donny takes off his headset and puts the call on speakerphone. After he puts the call on speaker, he picks up his sandwich to take a bite. You can see him smear the sandwich on his cheek to the left of his mouth. This mustard smear gets pointed out by Maria when she comes in to tell Donny he is due in court.
This is the first and only time the Barista/Waiter played by Paul Cosimano speaks. He says "Yes, it is". Normally he is just a background character.