Filming of Season Four ended on the 25th of April, 2013.
Hashtag during the airing was #GRRRduation
Matthew Davis makes his 50th episode appearance as Alaric Saltzman. The other actors who have appeared in fifty episodes (or more) are: Nina Dobrev, Paul Wesley, Ian Somerhalder, Candice Accola, Steven R. McQueen, Kat Graham, Zach Roerig and Michael Trevino.
In The Return Series, writer L. J. Smith had planned that Elena stays with Damon at the end. However, this was ruled out by the publishers, so Damon ultimately died in the Dark Dimension and Elena ends up staying with Stefan.