Continuity mistake: At the Playboy bunnies camp Captain Willard jumps off the boat with his rifle in his left hand. In the next shot as he turns around it's in his right. (01:23:30)
Other mistake: After we see Chief Phillips break up the fight between Clean, Lance and Chef they show a close-up of the Playboy Bunny's helicopter. It's pouring down but there's no water running off the helicopter or its windows. (01:25:40)
Continuity mistake: After speaking to Bill Graham in the tent Captain Willard comes back and tells the guys, "I negotiated two barrels of fuel for a couple of hours with the bunnies". As he walks back to the boat the hills in the distance can't be seen because of the rain but in the next shot when Chief Phillips comes over to talk to him the hills can be seen. (01:26:25)
Visible crew/equipment: Captain Willard says he made a deal with the playmates for all the guys and Chief Phillips says," you got some mama's in there?". You can see all the stage lights reflecting off their raincoats. (01:27:10)
Continuity mistake: At the Playboy Bunnies camps Lance picks up the second barrel of diesel fuel with both hands as he takes it off the boat. In the next shot both his arms are wrapped around it. (01:27:20)
Continuity mistake: After he decides to decline the offer to spend some time with the bunnies Chief Phillips picks up some tools off the roof of the boat. In the next shot he's already on the floor of the boat turned around and ready to go down the hatch to work on the engine. (01:27:25)
Continuity mistake: As the camera pans along from the rear of the helicopter to the front Chef says to Miss May, "I've got every one of your pictures". Watch very closely as the camera shoots through the two windows on the helicopter's door. The Styrofoam head with the black wig on it that Chef asks the playmate to put on is not up against the left window as it is several shots later inside the helicopter. (01:27:45)
Visible crew/equipment: Before we see Chef with his Bunny, the camera pans along from the rear of the helicopter to the front. First we see the reflected studio lights, then we see a great reflection of a cameraman with his equipment under a hood in the window of the copter. (01:27:50)
Visible crew/equipment: Inside the helicopter Chef says to Miss May, "Miss December has black hair." As the camera pulls back its shadow can be seen on the rear seat. (01:28:20)
Continuity mistake: Chef asks his playmate, Miss May, to put on a black wig as they sit in the helicopter. When he first reaches for the wig it's on top of a Styrofoam head but in the next shot he reaches for it again and it's on a small table to the right of the Styrofoam head. (01:28:50)
Continuity mistake: As the shot shows Chef and his playmate Miss May through the helicopter window it's pouring rain and totally overcast outside. In the next shot from inside the copter, water is cascading down the windows but the sun is now shining. (01:28:55)
Continuity mistake: As Chef grabs the black wig it's clear to see that the window on the helicopter door has a strain crack going down the middle of it. It's there for two shots then when Clean hammers on the helicopter door the first time it's not broken. After he climbs up onto the helicopter and bangs on the front windshield he comes back to the side window a second time and it's cracked again. (01:29:55)
Continuity mistake: Clean hammers on the helicopter door and says, "I got my rights, man." He's in direct sunlight when you see him from inside the helicopter and not in the shot of him on the outside. (01:30:00)
Continuity mistake: Lance is with his Playboy Bunny spreading makeup on her forehead as she says, "They make you do things that you don't want to do." Later as she says, "I wish I could find, just one person," he puts the make up on her forehead again. (01:30:05 - 01:31:05)
Continuity mistake: Inside the helicopter Chef poses Miss May with the black wig and says, "that's it, voila". The white bird sitting on his shoulder disappears between shots. (01:30:25)
Continuity mistake: Chef says to Miss May, "You're beautiful, I just want to " and a white Styrofoam ball appears stuck in her hair between shots. (01:30:25)
Continuity mistake: Lance's Playboy bunny gets up and runs around after she's startled by Clean when he taps on the window. She accidentally knocks over a casket with a body in it. The first time we see the body there's nothing behind it in the casket but some dried blood. When we see it again four shots later the blood is gone and the body has some bandages or tape lying behind it's left arm. (01:30:30)
Continuity mistake: Chef and Miss May mess around in the helicopter as he says, "I can fly like the eagle". They start out facing the back of the helicopter then in the next shot they're facing the opposite direction. (01:31:40)
Continuity mistake: After the boat docks at the Medevac Captain Willard gets out and walks around and it's clear from the wide shot that there's only one helicopter there. When he comes back to tell the guys about the arrangement with the bunnies we see a close-up of this helicopter and it has yellow tipped rotors. The helicopter that Chef and Miss May are in later in the scene is different as it has white tipped rotors. (01:31:50)
Continuity mistake: At the end of this scene the shots of Chef and Miss May in the helicopter at the Medevac were done in an entirely different place. All the outside shots of the helicopter have different backgrounds (trees, mountains, tower) from what we saw when Captain Willard first walked around the Bunnies' camp. (01:31:50)
Answer: It's not any specific song; it's just the kind of generic piano music you'd hear at dinner at a high-class restaurant of the era. Think of scenes in movies, films, etc. set or made in the '50s and '60s, where the characters go to a nice dinner and there's someone at the piano playing unobtrusive music to accompany the food/conversation.