The user shaleh on Reddit pointed out that section 5.3 on parameters blocks doesn't explicitly state that the new parameters come before the ones specified on each definition.

Point being that they are not really different, but the tutorial mentions both and doesn't qualify what the difference is.

The end of section 2.2 doesn't display the flag prefixes properly.

From #idris:

ziman: it's probably latex that converts "--" to an en-dash
jfdm: indeed it is
jfdm: you can get round it using \verb!--check!

Section 3.3 expands Nats at the REPL. Latest behaviour seems to pretty-print Nats as normal integers.

See idris-lang/Idris-dev#1503 (comment)

See idris-lang/Idris-dev#1502 where the following was reported:

It seems there's an error on the code example in 3.8.3 / Dependent Pairs:

data Exists : (A : Type) -> (P : A -> Type) -> Type where
    Ex_intro : {P : A -> Type} -> (a : A) -> P a -> Exists A P

has error:

When elaborating type of Main.Ex_intro:
No such variable A

I think it should be:

data Exists : (A : Type) -> (P : A -> Type) -> Type where
    Ex_intro : {A : Type} -> {P : A -> Type} -> (a : A) -> P a -> Exists A P

Add a section detailing how to roll your own library.

! notation is currently not documented anywhere except by example

The tutorial needs to explain the new 'Lazy' type and implict Force/Delay

Here:
https://github.com/idris-lang/idris-tutorial/blob/master/content/starting.tex#L75-108
Specifically, the :js / :javascript command no longer exists.
In its place, you can use :compile <codegen> <filename>.

Change

instance Functor Eval where
    fmap f (MkEval g) = MkEval (\e => fmap f (g e))

to

instance Functor Eval where
    map f (MkEval g) = MkEval (\e => map f (g e))

Use listings package and link to the provided examples within the tutorial instead of duplicating them.

Add an explanation that totality checking is not perfect (nor even particularly good yet). Too many people seem surprised when it doesn't work as well as they'd like.

idris-lang/Idris-dev#1553 makes the names of the library far more consistent. We need to update the documentation to match the renamings.

It would be a good idea to add a Creative Commons 4.0 License to the tutorial. BSD license isn't good for content. I propose use of the: CC BY-SA 4.0.

More information over CC licensing can be found here: http://creativecommons.org/

Update tutorial to account for bitrot since latest released version of Idris.

Of note the section on unit testing.

Create print and electronic versions of the tutorial.

It would be immensely useful to have even at least one of those available out of the box without having to clone the repo (or a fork really) and figure out a way to build it. PDF's aren't particularly nice for on-screen reading!

Currently the tutorial talks briefly about the so data type and using it to ensure some runtime check has been performed but it doesn't mention any ways to construct so types.

Someone in IRC got bit by this.
Just putting it here as a reminder to mention.