Mischeevious... that's a strangling offence in my opinion. Drives me nuts.
Sangwiches, foilage for foliage, and the noted one of someone academic I used to know who used Pacific in lectures she gave instead of specific, oh boy! That used to lose the students because they were so amazed at her coming out with it.
On the Cape Wrath issue, I was under the impression that it was a "wroth" sound, as in the hymn and novel The Grapes of Wrath. Funny how the English language can do strange things to what I thought was originally Norse.