In 'Regiment' we see the French Eagle that was taken by Sharpe in an earlier episode called 'Eagle'. The one in 'Regiment' paraded before the Prince Regent has remnants of a French Tricolour on the staff, but go to the episode of 'Eagle' when the Eagle is taken by Sharpe, there is no sign of the Flag - it is totally bare.
When Sharpe is entering the armoury with Sgt Ted Carew, Sgt Carews foot can be seen strapped up behind him. (He is wearing a wooden leg;e supposedly lost his leg at the battle of Talevera).
When Harris tears off the dead RSM's stripes off to give to Harper, the cellophane tape used to hold it on up to that point can be clearly seen glinting as he hands the chevrons over.