Corrected entry: Brundle's steak experiment has one major flaw in its planning: he takes care to separate the two cuts of meat by placing them on different coloured plates so he knows which is the control cut and which is the teleported cut, however he then proceeds to cook them both at the same time in the same pan. Being a scientist you'd think he'd know this could quite easily ruin the results of the experiment as whatever changes occurred to the teleported steak could leak out with its juices and contaminate the control.
Corrected entry: The whole problem with the teleporter occurs when fly DNA is mixed in with Seth Brundle's DNA, starting his transformation into the Brundlefly. Brundle is on a hiding to nothing from the word go, and the fly is irrelevant. Humans are a walking talking mass of foreign DNA - we are host to one trillion bacteria all of which has a complete compliment of DNA, as do various tiny mites that live in our hair follicles and all sorts of single cell organisms in our gut. If the transporter serves to mix the DNA of all living creatures which are in the transporter pod at the time Brundle would turn into a half-man, half-bacteria. Incidentally, DNA from a bacteria, an amoeba or a hair follicle mite would be just as 'compatible' with human DNA as that from an insect. It's quite a simple chemical, really.
Corrected entry: In the scene where Jeff Goldblum starts transforming into the Brundlefly, there is a long sequence where his skin and body parts keep falling off and making a huge mess on the floor. After John Getz blows the creature's telepod power cord apart with a shotgun, he collapses onto the floor which is now clean.
Corrected entry: In the scene where Veronica is interviewing Brundle and turns on the tape recorder, it stops the next minute because the tape ends. When her boss is listening to the tape we can see the tape is at the beginning at that time of the conversation.