Frankly spoken from a lab tech… not really, chemically wise. Todd could have written everything down, he has the recipe, but he doesn't understand a thing, if he's on his own. Every monkey can do a synthese with a work instruction.
But if something goes wrong, maybe forgot something or an impurity occurs and he does an error analysis, he's screwed, because in every step could lie an error. May it be the addition-elimination reaction, maybe he didn't put enough Aluminium catalyst, maybe there's too much water in the end he didn't stipped off enough (methylamin is a poisnous gas brought in water solution as a base), too low of the methlyamine precursor. Wrong temperature, etc., etc. …
The science of Breaking Bad: A No-Rough-Stuff-Type Deal « weak interactions