it is not wrong, it can be added. but "dikkat!" is not something you would use at home normally so it is very weird in this context. It is more like "attention!" so it would be used in an announcement or something like that.
'pot' is here not in accusative case but in nominative case. So this cannot be in accusative form.
As far as I know you would only have to say 'a pot' if it were 'bir tencere'. If there is no 'bir' you may translate as 'the pot' or 'a' pot.