When I first listened to the album I also got the feeling that the last three songs felt a bit out of place in terms of the overall sound of the album. I honestly think Lana added those three songs at the end so that the album could have some bops, because let's be honest, none of the other songs have the potential to go viral besides A&W and without Fishtail, Peppers and Taco Truck the album would feel too dense, I also think that Jimmy's part in A&W is another way of freeing the album from so much tension on such heavy themes. I also think the same as @Mer when they said that it could be a hint of what the next album might sound like.