When Frank falls on stage during the performance at SXSW, we can see he hits the head on the left side. When Jon goes to help him, the head is fractured on the left. But on the next shot, and in the following scenes at the motel, the fracture is now on the right side of the head.
During the rehearsal at Vetno, the song prominently features the sound of an electric guitar, yet nobody is playing one.
When Jon and Clara are in the hot tub, you hear the sound of vigorous bubbles, yet the water is perfectly calm.
Several shots, ostensibly showing Frank' s home town in Kansas, show mountains in the background. There are no mountains in Kansas.
As the band are in the van driving to the ferry terminal they are shown at a road junction with signs indicating that it is at the A55 and M6 taking a turn off for North Wales. The M6 heads North from the Midlands to Cumbria and at no point is there a junction with the A55 which runs from Chester to Holyhead (where the ferry terminal from Wales to Ireland departs).