Mac says he spent all the money he had with him to get his car fixed, yet he never pays the mechanic for the repairs --- he just thanks the mechanic and then drives away.
Why doesn't MacGyver just call up Pete and have the Foundation bail him out? This would be far from the first time the Foundation has helped MacGyver out financially when in a bind.
Mr. Wiley acts surprised when the Rigels tell them they are leaving that very night. But a few scenes earlier Tommy told MacGyver his father said they were leaving that night - nothing has changed and he already knew they were leaving later that day.
Mac could not have dialed the garage's number, since the boy's father had not told him the number yet.