I do not know whether its a deliberate move so that people would talk about it or whether it was a careless mistake.
I noticed this a week ago or so I thought but was not too sure but "Valaradhe Kanna" especially "Valaradhe" reads wrong. Unable to recreate it here as I cannot type Tamil on this one..
If someone knows someone at that Ad agency please let them know - perhaps its time they got that right. Wonder who checked the Ad for correctness.