Corrected entry: When Greene and Benton are at the coffee stall, Greene calls Benton "Eriq," which of course is the actor's real name.
Correction: I agree with the correction, Greene does not say "Eriq" at all. Benton says, "Hey, Mark," to which Greene replies, "Peter" and then continues talking.
Correction: I heard Eriq while watching E.R. Via Hulu. This may have been changed for the DVD version.
I've seen the Hulu version and hear him say "Peter." The subtitles even confirm it.
Correction: Mark does not call Peter "Eriq", he calls him "Peter" - he says it quickly and the audio is a bit unclear with the sounds of street traffic, but if you turn up the volume, it is indeed Peter.