I just watched the first series on coaches film.
If you want to chart missed opportunities there were three on that drive. Not blaming Dak because we don't know his read progression for sure and what his coaches have told him to do.
1-10-20> Shotgun, 12 personnel, Zeke split wide left and motions into backfield. Witt strong left. Dez, Beas and Williams split rt. Witten drags to right, Dez angles to middle, Beaz straight up field and Williams an out. As Dak throws, all but Dez are clearly open...Beasley likely would have been TD, Williams a gain to about 7...Dak takes safe throw to Witten.
1-10-10> Shotgun, 11 personnel, Witt strong rt. Dez l slot, Beas and Williams left. Dez straight up seam....immediately open. Beasley drags behind him. High throw that Beas drops. Would have walked in. Dez would have walked in. DRC was lined up over Dez in slot and blitzed. As Dak set to throw DRC jumped, possibly blocking view of both Dez and Beas and making inaccurate throw. Beas has to catch this though. With two guys wide open, huge miss.
3-7-7> Shotgun, 11 personnel, Witt Strong L. Dez single rt. Williams l slot, Beas wide L. Dak checks down to Elliott crossing for short gain. When he threw, no one was open but no pressure. Could have held as Dez was just breaking open across end line. Another missed opportunity.
There are options on almost every play but it's hard to say exactly if Dak made the wrong play. In general, he was throwing to an open receiver so it's tough to say he made a bad play.