Stan is cleaning his rifle with his handkerchief but in a reverse shot there's no handkerchief.
When the will is being read it shows Mr. Miggs occupation on his shingle as lawyer. However, since this takes place in Scotland, the proper term should be Solicitor or Barrister.
The clock on the mantle piece in the lawyers office is an American Mule clock and would not have been available in Scotland (it's the same as the one in the house in Oliver 8th.)
The Scottish band in India features a euphonium but only American bands had them at that time..
At around 43 mins into movie, Col McGregor is talking in his office, when a stage curtain starts to lower. It only lasts about 2 seconds, but it's clearly seen.
When Stan and Ollie jump and roll out of the Balcony, Stan rolling down wasn't fast enough as soon as the mob showed up to jump down Stanley disappeared Indicating a film cut.