'slightest things' is a correct and usable phrase in written English.
You can use it to refer to insignificant matters or minor issues that may have important consequences or repercussions. For example: "The slightest things can often cause the biggest fights in a relationship."
In the newness of the world God was a young man, and grew indignant over the slightest things.
Though as I have found out since, some children do get scared by the slightest things, don't they?" Is there no end to the inexorable rise of The Gruffalo?
Since he matters so much more than any other living artist right now, and operates in his own personal sphere where he can make the slightest things significant – the other day he witnessed and filmed a street fight and it became world news – there is little doubt that he will be the star.
He'd press release about the slightest things (the press release was always written by him in the third person) and the whole thing seemed to be slightly made up.
She would get angry over the slightest things, and start to cry at nothing, and yell at her parents just to feel like she could do something about her messed-up life.
"It is like I feel good in the past and the slightest things knocks me down.
I'm one of those people who tears up at the slightest little things -- a tidbit of news, an earnest child, the national anthem playing in the distance, a touching television commercial.
Or – as Wu did, prior to receiving these offensive messages – because they've poked a little meme fun at those making the most noise about the slightest little things.
"They weren't slight little things," said Mason, who joined the Jets in August after spending the last six seasons in Baltimore.
"But now the slightest little thing triggers it, whether it's going through a subway tunnel or someone dropping something on a train.
"The slightest little thing that maybe normally would not have bothered him would be very upsetting".
