bitch got over the wall - he talking about the water spaniels. suggesting that as water spaniels are to water, a man is to his own sense of self. therefore he's questioning norfolk's selfhood.
it's a lion he married - more is just complementing alice's courage and ability to still love him whilst she still has no idea what he is doing and is unable to comprehend why.
more would give the devil the benefit of the law - this quote just demonstrates that more has the utmost faith in the law to protect him. ultimately, it is this belief, along with a few others, which bring about his demise as cromwell and the king just change the laws to what they need them for.
this isnt spain - spain was governed by the church, england, since henry declared himself supreme ruler of the church of england, is not.
also, one thing to keep in mind, is that more is a singluar/lone character. everyone else is pretty much opposed to him in some way.