Rockford is talking to Megan Dougherty at the beach. There's a red radio on the other blanket. When Megan's friend comes back, the red radio isn't on the blanket.
The phone number on Megan Dougherty's phone is 555-2368, which is the same number used for Jim Rockford's phone.
After Angel suddenly disappears from Rockford's trailer the door is shown left swinging open. The scene outside the door is obviously a background scenery painting.