Looking at the Bob's Burgers IMDB page and, despite the last season 14 episode airing back in May, there are 3 additional season 14 episodes set to be released in advance of the season 15 premiere on Sept 29th.

• Sept 08 - S14E14 - The Big Stieblitzki
• Sept 15 - S14E15 - The Right Tough Stuff
• Sept 22 - S14E16 - ?? title unknown ??