Redstone, Repeaters, and Comparators Render Incorrectly on Barriers, Slime Blocks, and End portal Frames
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This also affects the dirt within plant pots

But if they now can go somewhere with a bottom texture, shouldn't they get one for that situation?
All I wish is for Mojang is to:
1) Make redstone render when looking at a barrier with redstone on it while looking at the under side
2) Make a bottom texture for repeaters, comparaters, and other items that have no bottom texture
zombie hunter: I totaly agree with that.
In 14w07a this can be fixed already using a resource pack. If you give ladders a 3D texture, then you can place them on barriers and they look quite fantastic: http://i.imgur.com/VnB83aN.png
Now Redstone/repeaters and things like that just need to support edited models, and then this won't be an issue, either.

@insomniac_lemon:
The json system for block models looks unfinished, several blocks are still missing (repeaters, comparators, cauldrons, hoppers, ...). It's very likely that repeaters will be supported soon (at least it would make sense). Btw., your ladders look great, would you mind posting the json files here?
zombie hunter: If you want the model to fix this problem, all you have to do is put the default model files in your pack and copy the plane element (putting a comma after the first one) and changing the "facing" value of that to the opposite direction. I suppose I could make a resource pack that does this just to fix this issue (and more of them as the list of models we get expands).
However, if you want it just to use it, I don't want to allow other artists to use that quite yet. Maybe in the future. However, tutorial I made about making block models so hopefully it helps people make their own models.
Aah, it would be so useful if you could see redstone underneath barriers. Damn shame.
ok guys, there is not yet a texture for the bottom of redstone because it never was needed in the past

An now, if you are going to build a redstone circuit on barriers, you will face the consequences
Mojang doesn't consider this a problem, though, as Barriers are given only through commands, likely why it's WAI. Placing redstone or ladders on barriers is a bit like an "unsupported action" that they don't intend to allow you to do (without these issues at least).
Fixed in version 14w10b (10a?) with the addition of "twoSided" parameter for faces!

Well, on ladders. They might also add it to redstone eventually

Happens also with Slime Blocks. – redstone wire and comparators etc, placed on top a Slime Block.

I would suggest a reopen, for slime blocks and end portal frames.
Not a rendering error, that's just how the underside of repeaters and comparators looks like. They don't have a bottom texture. Don't place them on barrier blocks. Ladders could need a backside texture though ...