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The actor is not acting like a drug user in the film, the actor just seems to be under the influence. Perhaps if he is, he most probably did it to help intensify the character.
Stimulant use doesn't impair or cloud your focusing ability, it highly enhances that. Using stimulants like cocaine or amphetamines make you focus like no other. Imagine what steroids does to your body for muscle and strength, that's sort of what cocaine/stimulants do to your brain. It enhances your focus. Under the influence of stimulants makes you focused, alert, intense, confident, sharp and "on one".
Being twitchy/falling apart/sloppy would be symptoms of over use/abuse. Being sloppy isn't really related to stimulant use. Being sloppy would be more related to being too drunk or too stoned from marijuana smoking.
In the film Jake appears to be very alert, intense, focused, sharp, confident, "on one", skinny, bug eyed, hollow faced, and has shiny skin and dark rings around the eyes. All are symptoms of stimulant use.
Last edited by TheMovies; 03-26-15 at 10:59 AM.