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As the Mountain charges, we can see a bit more heraldry. On his right is the famous House Royce arms, featuring bronze hues and the runes of the First Men, which Bryan Cogman has cited as a favorite of his. And just glimpsed on the left, the Tully arms. Although both are somewhat changed from how they’re described by George, the essence of them is still there.
The heater shield is interesting. It’s a detail we’ve not made note of before, but basically the rim is turned up, which seems like it would increase the cance of a lance catching a firm hold as it strikes, greatly increasing the chances of a broken lance or an unhorsing.