The Beach Boys - Pet Sounds

As I write this, I am listening to one of the most exquisite pop albums of all time: my mono copy of The Beach Boys Pet Sounds (Capitol C1 0777 7 48421 1 2, 1966?). Side 1 says "DOS MANO." "Mr. Hand?" A search on the web shows that, beside Spanish, this phrase may translate in other languages. However the reverse has "EL SLACKO." This is probably some inside Spanish lingo jokes from the group, I'd say. Another major label inscription is on Yes Tormato (Atlantic SD 19202, 1978). Side One says "STRAWBERRY - Seán". I am sure this is because disc cutting was done by Seán Davis at Strawberry Studios, London. Did he fave permission to do this, or did he just take the liberty to add his name to an album that he knew would be in the hands of millions?