But, if you watch the current version of the movie, you'll see that it's all been slimmed down.
Just compare the two versions of Lovelady:
And here's the link where you can see it yourself. It occurs at 39 minutes and 35 seconds:
They deliberately slimmed him down, realizing that the original was too stocky and too muscular to be Lovelady or anyone who could easily be mistaken for Oswald. There is no other explanation for what we see.