It refers to a Victorian stage instruction to the actor, in the script. See https://books.google.com/books?id=h2mzBQAAQBAJ&pg=PA94&dq=what+does+%22R.2.E.%22+mean+in+a+theatre?&hl=en&sa=X&ei=HQYGVaS4N_PksASZn4DQAQ&ved=0CCgQ6AEwAg#v=onepage&q=what%20does%20%22R.2.E.%22%20mean%20in%20a%20theatre%3F&f=false
It's about as clear as I can find as a stage instruction. I'm guessing from the script that accompanies the footnote that the E refers to enter. The footnote says L. means Left, but I think from the context it means "leave". Good luck.
On Saturday, March 14, 2015 1:33 PM, Scott Holmes <[log in to unmask]> wrote:
There is a remark in the review, as posted on the virginia.edu site
" "Mark Twain's" first peek-a-boo at R.1.E. was greeted with
What is R.1.E. ?