People are like, "how do you tell the difference between Hurley and Charlie," and all you need to know is that Hurley has the energy of an office middle manager who's been at the job too long, and Charlie's energy is gremlin who's been let out confinement and ate sugary caffeine.
Otherwise, key physical differences are:
-Hurley has a head that is SO SQUARE while Charlie's is more rounded.
-Hurley has a silver legband while Charlie's is red.
-Charlie has a few random yellow feathers in odd places while Hurley does not.
-Hurley often looks anxious