In season 3 in the episode with the gorilla city I'm pretty sure The Flash carries a whole bunch of people at once. We see one bundle of red flashes flowing though the forest and at the end suddenly releasing a flash and 3 or 4 of his companions. If he carried them one by one, we should have seen the bundle of flashes move back and forth several times (once for each person) releasing one at a time.
Also at least in the TV series The Flash does not seem to have special superhuman strength. I can't remember him doing anything like lift or throw heavy objects a normal human could not lift or throw. Hitting someone with super-speed (and heavy impact) is a side effect of his speed ability.
And even if he had superhuman strength, how could he carry more than 2 people (one under each arm) at once?
Was this a writers mistake? Or is it canon that the TV flash has superhuman strength and can carry multiple people at once?