The bridge was in the process of being removed in 1935. There are photos of the 1935 races with all the wooden supports around the bridge, and the builders were waiting for the races to finish so that the road could be closed.
If you watch "No Limit", they actually use the fact that the bridge needs repairing as part of the storyline when George arrives in Douglas for "the Trials".
And of course the film crew used the 1935 Senior for some of the footage for the film, i.e. the crowd in the Grandstand is the real crowd for the actual race, and they were all asked to cheer at the appropriate time during the film. One reason I know this is because my Dad was in the crowd.
There are many references to the bridge removal, and the film (directed by Monty Banks) in the 1935  January-June volume of the "Motor Cycle".