All false.

1) There was a batch of 169K absentee ballots counted at once from Milwaukee that ran about 75-25 Biden.

2) In MI that was an input error that added a 0 and was fixed in 30 min.

3) PA rules didn't allow them to count mail-in ballots until after. Were not all Biden. https://twitter.com/NickAdamsinUSA/status/1324151663641448448

I get that people are desperate to create a narrative, but spreading blatant falsehoods to undermine trust in our institutions is harmful garbage. It won't help Trump win, but it will hurt your credibility.

This is another claim/video that went viral claiming to show someone burning ballots. It is false.

The video is actually of someone burning sample ballots: https://www.vbgov.com/news/pages/selected.aspx?release=5046&title=city+of+virginia+beach+election+brief+%E2%80%93+5+p.m https://twitter.com/DallasTexasTV/status/1324096135909285889

It is not true that Trump observers were not being allowed to watch the ballots being counted in Philly. The argument was over how close they can stand to those doing the counting.

Also, the counting is even being live-streamed to the public:

https://twitter.com/jimgeraghty/status/1324529581605507073

People have also been posting videos claiming to show workers filling out ballots. Ex: https://twitter.com/jondelarroz/status/1324545566643159040

They are not filling out new ballots. These are duplicated ballots to transcribe those that the scanners can't read.

https://ovi.csg.org/ballot-duplication-what-it-is-what-it-is-not-and-why-we-are-talking-about-it-in-2020/

Here is a good short description of the process. It follows an adjudication that usually involves observers from all sides. The stamp he is applying is to note it is duplicated and the original was voided. They are kept separate for any review.