Ollie and his blackmailer are sitting in a desk chair by a window. When people burst into the office, the chair is now suddenly on the other side of the desk. Moments later, the chair is back again behind the desk and near the window.
When Mae Busch enters Ollie's house in long shot he's holding sheet music in one hand but in close up he's holding it in both hands.
In the opening scene, Ollie is admiring his picture in the newspaper, in an article announcing his candidacy for Mayor. Under his picture, the caption reads "Oliver Norval Hardy" - his real name,
except that in all biographical sources, his middle name is spelt "Norvell".
(At around 3 mins) The camera is on the notepad and the pencil that Laurel is holding breaks. We can see that Laurel only squiggled on the notepad rather than writing the words Hardy had told him to write.
Those "squiggles" are in fact Shorthand, an abbreviated symbolic writing method that increases speed and brevity of writing as compared to a more common method of writing a language. Shorthand was used more widely in the past, before the invention of recording and dictation machines.
Just before the end as the boys are in the process of trying to sneak Mae Busch out of the house the light colored strap on her gown breaks and she can be seen holding her top up with her left hand.
The first time Ollie's old girlfriend telephones during the dinner party, the butler answers, does a bit of business reacting to funny noises from the receiver, then says "Yes, ma'am?". But he has no way of knowing that it's a woman calling.
In the colorized version, at the start Ollie is looking at his photo in the paper. The photo has also been colorized for an age when no color photographs would have appeared in the papers.
(at around 24 mins) Hardy demands that Mae Busch leave his house, he then fires a gun. As he does this look at Stan's hat - it clearly has a thin piece of string attached to the top of it which is pulled upwards as the gun is fired to give the impression that his hat flew off in comical manner as a result of the action on screen.