1 -well, he almost got killed by a giant lizard. if i were him, id go into hiding and not be heard from for awhile lol
2 - i get what youre saying, but its minor, doesnt break the movie
3 - hah idk, he did let the thief rob that store, and he gladly walked away with stolen milk. so id say him stealing it is possible. or he did buy it and got a huge discount kuz he had been working with Conners. he didnt make the webs. those were already made. i think they presented him very smart. he understood what Conners work meant infront of that class on that tour. he remembered his dad's formula from memory. he knew how to make the antidote at the end. and in the comics, peter does make the web shooter originally.
not trying to troll you or anything dude, but heres my reply to those plot holes
1- after spiderman stopped lizard from getting that middleman, thats when lizards motives changed. the whole reason he was going after him in the first place was to stop him from going to the veterans hospital for human subjects. after lizard was stopped, and took another sample, thats when he started hearing the voices and wanted everyone to be a lizard like him. so what that middleman stood for and wanted to, no longer mattered to lizard because they were basically on the same side now.
2-you could just assume that the father figured peter arrived without him knowing and peter just went straight to gwen's room. or maybe her father wasnt home yet and he figured peter could of arrived when he was not home.
3-peter didnt buy all that stuff from oscorp, he stole it. it was pretty well established that peter was a smart enough guy to figure all that out. and i would think there would need to be a lot of tech that would have to go into web shooters. has to shoot perfectly straight, hold the weight of a car, be sticky, hold a lot of ammo, be water proof..some high tech stuff.
4-that i might have to give to you. possibly though, most people wouldnt believe that spiderman's secret identity is that of a teenager. he does have "man" in his name. the passenger on the train in spiderman2 thought the same thing
ive seen the movie twice now, and i guess ive had more time to think about the movie and pick up on the smaller details. but i see where youre coming from