IMO, No errors on any play.
While the standard is ordinary effort, generally its interpreted as basically requiring the fielder either touch the ball or essentially have it go through him (e.g., infielder ball between his legs).
Instance 1 was a miscommunication between three fielders; instance 2 was a player who will now never forget his sunglasses and use his glove to block the sun; instance 3 could be attributed to the weather.
The good news is that the first two instances provide great teaching moments and learning and implementing solutions will build the kids baseball skills.
The third instance will bedevil fielders - but over time each will learn to read how the elements effect the ball - and the result will also lead to improved skills.