• 4.01 - Charmed Again Part 1
When the girls summon Grams for the second time in the attic there is no candles but the book states that they need a circle of candles.

• 4.02 - Charmed Again Part 2
Cole is stabbed in the day time and left on the pavement, the girls arrive at the night did no one walk past or near during that time that could have called a ambulance?

• 4.03 - Hell Hath No Fury
When Phoebe levitates to kick the furies in the manor you can clearly see that it is Alyssa's stunt double.

• 4.04 - Enter the demon
An-Ling stabbed Yen-Lo quite deeply why didn't her sword have any blood on it she stabbed him deep enough.

• 4.05 - Size Matters
When rescuing the girl on the shelf Phoebe says 'We got to go before Gammill sees us', how did she know Gammill's name?

• 4.06 - A knight to remember
The Princes sword should have made a dint in the truck but it didnt.

• 4.07 - Brain Drain
The Source changes colour three times. In 'All hell breaks loose' he has red hands, then in this episode before he becomes Alistair he has black hands and then in Charmed and Dangerous he is white.

• 4.08 - Black as Cole
The Belthazor's human form page that Phoebe wrote in season 3 is missing, instead it has the 'To summon Belthazor spell'

• 4.09 - Muse To My Ears
Blooper free... so far.

• 4.10 - A Paige From The Past
Paige's bedroom from the past has problems with dating it has numerous pieces that weren't available until much later.

• 4.11 - Trial By Magic
Evidence is bagged at the scene, tested and then bagged again. A murder weapon would not be passed around the jurors unless it was bagged.

• 4.12 - Lost And Bound
In 'Magic Hour' Phoebe said Grams was married four times but in this episode she was married six?

• 4.13 - Charmed And Dangerous
When Piper is hit by the source and thrown into the wall if you slow it down you can see that it is Holly's stunt double.

• 4.14 - The Three Faces Of Phoebe
Blooper free... so far.

• 4.15 - Marry Go Round
Paige fell asleep repairing Phoebe's wedding dress but when she woke up it was ready.

• 4.16 - The Fifth Halliwheel
The dolls house destroyed by Paige in this episode was already destroyed by the evil enchantress, this piece also returned again and can be seen in various episodes after this one.

• 4.17 - Saving Private Leo
When the power cuts out at the manor and Phoebe looses half her document she goes to call Cole... but how could she the powers out?

• 4.18 - Bite me
In 'Astral Monkey' Dr. Williamson is given the sisters powers by infecting his blood with theirs which means their powers must run in their blood too which would have anomalies in it. Why did the girls allow for their blood to be taken and tested?

• 4.19 - We're off To See The Wizard
The Grimoire protects itself from good so wouldn't it protect itself from good magic as well as Paige's good orbing power?

• 4.20 - Long Live The Queen
Blooper free... so far.

• 4.21 - Womb Raider
When Piper receives the news that she may have trouble conceiving a child due to scar tissue caused by blows to the abdomen why didn't Leo try and heal it?

• 4.22 - Witch Way Now
How could Piper break a big piece of wood like that? Why didn't Paige call for the amulets?