Ball he spilled wasn't a simple shot at all, palmer hit it very deliberately so it bounced right infront of him, that makes it an infinitely more difficult shot to take in, any Sunday league keeper will tell you this.
it's a shot a lot of keepers would choose to parry and obviously in hindsight he should have too but Ederson usually smoothers them well. Little bit of early season rustiness effects the keepers too, it's not a concern.
The save he made from Jackson wasn't so much the reflex save itself, I'd expect every premier league keeper to do that, the inportant part was the correct positioning so that he can make that. top keeping