[1] Wallis has served as the Western Bulldogs' vice-captain under Marcus Bontempelli from the 2021 AFL season onward.

[2] He captained Vic Metro in the 2010 NAB AFL Under-18 Championships, where he averaged 28 disposals at 83 per cent efficiency in three matches before being injured.

In the 2010 TAC Cup Grand Final, he had 47 disposals and was awarded best on ground, in the Cannons 58 point defeat of Gippsland Power.

[6] On 23 July 2016 Wallis suffered a sickening leg injury in which he kicked the lower part of his left leg with his right foot while being tackled by Shane Savage midway through the final quarter of the Western Bulldogs' 15-point loss to St Kilda, causing both the tibia and fibula to break.

The injury ended his season, and he subsequently missed out on the club's premiership win in October.