When looking out of the barrack's window, Hogan points out the radio detector truck in the compound to the others. Shortly after, when Le Beau, Carter and Newkirk cut off Kinchloe's radio transmission, Newkirk says the detector truck is outside the compound.
Hogan's birthday cake has 4 "candles" on it that the gang intends to use to fire at the radio truck. In the next closeup scene of the truck, 3 shooting candles make a direct hit into the open door. In the following wide shot, the cake only has two lit candles while two candles are still unlit.