In the series Silicon Valley, Season 2 Episode 10, When Richard is contacting the guy at home, why is the bus having bicycles attached to the front?
In most cities if not all, a great number of buses have bike racks for two bikes. Your clip showing a bus with two bikes on it is simply a way in keeping with maintaining authenticity as Wait has pointed out in his comment. Where I live, bikes on buses are very commonplace.
Even here in Canada, bike rakes on buses are very popular:
Many of the following routes are in and around the City of Vancouver. Vancouver has an extensive public transport system run by "Translink." most buses have bike racks for two bikes and there are three major "Skytrain" routes which will carry bikes. - Routes, Paths & Directions
We even have a Tunnel Shuttle Trailer for bikes.
The website Go Bike by Bus shows how to load your bike onto a bus.