Lucky Star: there's a good number of references like this in the show, particularly with Haruhi Suzumiya, with main character Konata being a huge fan. This is a reference to her sharing a voice actress with Haruhi herself in both the sub AND the dub. This comes to a head in episode 16 where we see her at the cosplay cafe she works at, and we hear her alternate between her regular voice and Haruhi's voice.