I have to confess that shortly after the code exam started I became frustrated and dropped my pencil ready to give up. That caused the guy beside me to stop printing, which made me realize that I was distracting the group.
At least you realized that this was distracting others, and stopped.
When I was testing for Extra, I had just finished passing the Advanced and Extra written tests and moved over to the area that was giving the Morse test. There were eight of us at the table, IIRC. One of the hams taking the test wanted to use a keyboard. This was his third time taking the 20 WPM test. So they brought out a computer or terminal with a keyboard. It was a bit annoying to everyone because, he was only getting ever couple of characters. So there were odd clicks and clacks. Finally, he gave a grunt and pushed the terminal to the side and grabbed a pencil. He fussed around through the rest of the test
None of this bothered me. I was nice and calm and didn't have any problems observing him, and copying at the same time. To me, he was just a bit of QRM. But I think it upset the rest of the hams being tested. While we were copying, I could see that the others at the table were having a hard time concentrating. In the end, I was the only one at the table that passed (100% copy). The other guys should have asked for a retest, without the other guy around.
Are you sure they let you take the written Extra BEFORE you had to pass the 20wpm code test? When I passed the Advanced at the FCC Office 4 and a half decades ago, you could not take the written portion of the Extra exam until you passed the 20wpm code exam. When the examiner informed me i had passed the Advanced exam, perhaps because i was a young teen, he encouraged me to try to pass the Extra. To do so you had to pass the 20wpm code portion BEFORE they would hand you the written portion of the Extra exam. 20wpm was right at the upper limit of my receive capability at the time, and i had not prepared at all to try and pass a 20wpm code exam. Once i put the headphones on and the FCC examiner started the tape, i froze up because i knew i had to get perfect copy to pass and thoughts of that kept interfering with my ability to let my brain do the work needed. The FCC office was pretty intimidating for a kid and i needed to have prepared like i did for the Advanced to have the confidence needed to think clearly.
ten years or so ago when i went to a VEC exam to pass the Extra -- because i had started wanting to work DX and the CW privileges became VERY attractive -- i was amazed how relaxed the whole thing was (finding the actual exam questions published online beforehand to study did not hurt either) 
Yes, I am absolutely sure that I took the Extra written test before the Morse Code test. I took the Advanced written test followed directly by the Extra written test. In fact, all of the hams at the table, taking the Morse Code test, had already passed the Extra written test. Maybe it's because your testing was done at the FCC office and mine was not. Maybe there was, but I don't recall any rules that dictated the ordering of those two tests.
Two months prior to upgrading to Extra, I upgraded from Novice to General, in a single VE session. I took the Tech and General written tests, back to back. And then followed it with the 13 WPM Morse test.
I don't see were it would make any difference which test (Extra written or 20 WPM Morse) was taken first. With each test you passed, you got a CSCE that was good for a year. You could always come back the next month and take the one you failed.
And yes, the VE sessions that I attended were very nice and relaxed. There was no pressure on anyone. A very friendly atmosphere. The VEs were very professional. I didn't have any problem with the Advanced and Extra written tests. I was a engineer for many years before I took the tests. The only prep I had for the written tests was reading through the question pool twice. I just needed to get a feel for the questions. But getting ready for the 20 WPM Morse test, took a bit of work.