A late Oliver Norburn goal denied the Glovers victory on Saturday, but Johnson's side remain unbeaten ahead of their next fixture against Stoke.
Having only conceded two goals this summer, Johnson is still demanding more from his players.
He told the Western Morning News: "The way that we played wasn't totally comfortable.
"It looks like we have a group of players who need to be given instructions rather than dish them out to each other.
"Perhaps we will be looking to get more of that out of some of the older and more senior players.
"We will get there. There's plenty of time."