Re: Avengers a culmination of Marvel history (including 616/Ultimate/etc.)
Hawkeye and Nick fury are taken from Ultimate versions.Although case can be made Fury has elements of 616 Fury.Ultimate fury Is primarly a general.Particly In The Avengers I can some of classic 616 fury In.
Shield Itself comes off more like 616 version.
They crossed The hulk's origin between the ultimate version and TV show version.
They had Tony Stark be publicly known as Iron Man after ultimate version although apart from smart assery Stark Is more like the 616 version.
Hawkeye Is pretty much only one that Is totally based on Ultimate version