When Skyler checks out Jesse's MyShout page, it says "MILF's, MILF's, MILF's, MILF's!" to which Skyler asks herself "What's a MILF?" Despite his professed love for them, the only time Jesse is ever actually with a MILF is the sexy neighbor in the pilot. Every woman he has sex with thereafter is close to his own age.
Jesse uses hydrofluoric acid to get rid of the corpse. This is extremely toxic and can only be used in a controlled environment with extreme safety measures. The gloves and masks he puts on are nowhere near enough, let alone them standing near it once the bathtub gives way. They would have suffered extreme lung and eye damage from just standing there.
The labels on the large bottles of acid grabbed by Walt from the chemistry lab misspell "hydrofluoric" as "hydroflouric".
No high school chemistry classroom would ever have hydrofluoric acid or gas masks.
Walt refers to hydrofluoric acid as a "strong acid" when in reality it is a weak acid.
When Jesse throws Emilio's body into the tub to dissolve it with the acid, we get a close up of Emilio's face from the bottom of the tub. Though Emilio is supposed to have been deceased for days, you can clearly see his rapid eye movement from behind his closed eyelids, causing his eyelashes to blink rapidly.
After the bathtub falls through the ceiling, a huge chunk of carcass is seen on top of the pile, but when it goes to the next shot, the pile is missing and it is all smaller chunks.
When Skyler is browsing Jessie's MyShout page, the resolution (or perhaps CSS) changes when they pan back to over her shoulder.