It is only in the fhird case that we see this happening, and the Elizabethans loved word play so much that I really doubt if the actor's welfare was a faotor in favour of a pun.It was therefore necessary to provide cues so the actor would know when his line was coming up, hence the very distinctive rhyme and rhythm.
Not the same thing as you originally said at all, and already mentioned by me above"Shakespeare’s plays were written in verse for other practical reasons. First, an actor might have to perform as many as forty plays a year, so lines of verse were easier to memorize."
Even here however we can doubt how much of a factor this was. Shakespeare often introduced prose into his plays, and when he did he was nearly always for low life characters, such as the Porter in Macbeth. Blank verse has probably much more to do with the social position of the character than the memory capacity of the actor.Rhyme and rhythm obviously make it easier to learn your lines, which is why we can learn chunks of poetry much easier than chunks of prose. I suspect that is what they are referring to.
To quote myself again:Rhymed couplets occur frequently at the end of a scene, punctuating the dramatic rhythm and perhaps serving
as a cue to the offstage actors to enter for the next scene." (my emphasis)
As the learned professor and I are in agreement as to the locations and frequency of rhyming couplet,s all we have to do isAs I said rhyme is rare in all but the early Shakespeare. When he does use it, it is often at the very end of a scene to give a sense of completion - which rather puts paid to the prompt idea.
decide on his 'remind the new actors of the next scene hypothesis'.
I suppose it's possible, We can imagine as the actors from the previous scene all walked off the stage in full view of the actors for the next one who said to themselves "Nah, that ain't the end of the scene; they've probably all just got a bad attack of the runs. Should lay off the steak and ale. Anyway, they'll be back in a minute" Or maybe Shakespearian actors were all unionized and it was common for them to walk off mid-scene for a mandatory tea break.
One piece of advice, lolwhites. When a scholar says 'perhaps' what he really means is "this is an idea that has just occurred to me off the top of my head, and I actually haven't given it any thought, but I thought I'd chuck it in anyway just to see if it floats".
Actually, you could make a case for the rhyme being a useful prompt for the other actors on stage, telling them to get off, but who the rhyming couplet really gives useful information to is the audience. Remember that there is no curtain or lighting to announce the end of a scene, and also that there is no scenery to tell the audience that the location has changed. A rhyming couplet, giving completion, would let them know that the scene was over and that the next scene would probably take place in a new location (though if you llook at "Romeo and Juliet" and think of the layout of an Elizebethan stage you can see that it is fairly normal for a new scene to take part in a different physical location on stage to the previous one; this is less clear however with the later tragedies).
Now, all we need is revel to come up with some cite for Hamlet being the work of Mike Leigh and cast in a former reincarnation.