Question

Hey, i just wanna ask if it s possible to say "there s many …" I mean in informal language of course;) Thx for answer;) Balli;)

Used but incorrect.

In a forum I was browsing recently, somebody even mocked Obama for saying 'there's many people'.

but there's a proverb saying ' there's many a slip 'twixt the cup and the lip' (meaning many things may go wrong before you do something you have planned to do) 

hello guys

we should not pay so much attention  to informal lang   it is not a big deal.