diff --git a/src/ytdl_sub/config/validators/variable_validation.py b/src/ytdl_sub/config/validators/variable_validation.py
index 32a7fcbe..415d8464 100644
--- a/src/ytdl_sub/config/validators/variable_validation.py
+++ b/src/ytdl_sub/config/validators/variable_validation.py
@@ -1,4 +1,6 @@
 import copy
+from typing import Dict
+from typing import Iterable
 from typing import List
 from typing import Optional
 from typing import Set
@@ -13,10 +15,18 @@ from ytdl_sub.config.validators.options import OptionsValidator
 from ytdl_sub.downloaders.url.validators import MultiUrlValidator
 from ytdl_sub.entries.script.variable_scripts import VARIABLE_SCRIPTS
 from ytdl_sub.script.script import Script
-from ytdl_sub.utils.script import ScriptUtils
 from ytdl_sub.validators.string_formatter_validators import validate_formatters
 
 
+def _add_dummy_variables(variables: Iterable[str]) -> Dict[str, str]:
+    dummy_variables: Dict[str, str] = {}
+    for var in variables:
+        dummy_variables[var] = ""
+        dummy_variables[f"{var}_sanitized"] = ""
+
+    return dummy_variables
+
+
 def _get_added_and_modified_variables(
     plugins: PresetPlugins, downloader_options: MultiUrlValidator, resolved_variables: Set[str]
 ) -> Tuple[Set[str], Set[str]]:
@@ -91,9 +101,7 @@ class VariableValidation:
         )
 
         # copy the script and mock entry variables
-        self.script = copy.deepcopy(overrides.script).add(
-            ScriptUtils.add_dummy_variables(entry_variables)
-        )
+        self.script = copy.deepcopy(overrides.script).add(_add_dummy_variables(entry_variables))
 
         return self
 
@@ -117,7 +125,7 @@ class VariableValidation:
 
         resolved_variables = added_variables | modified_variables
 
-        self.script.add(ScriptUtils.add_dummy_variables(resolved_variables))
+        self.script.add(_add_dummy_variables(resolved_variables))
         self.unresolved_variables -= resolved_variables
 
         return added_variables
diff --git a/src/ytdl_sub/script/types/variable_dependency.py b/src/ytdl_sub/script/types/variable_dependency.py
index 3e43e8c7..9fbe3ebf 100644
--- a/src/ytdl_sub/script/types/variable_dependency.py
+++ b/src/ytdl_sub/script/types/variable_dependency.py
@@ -1,7 +1,6 @@
 from abc import ABC
 from abc import abstractmethod
 from dataclasses import dataclass
-from typing import Callable
 from typing import Dict
 from typing import Iterable
 from typing import List
diff --git a/src/ytdl_sub/script/utils/name_validation.py b/src/ytdl_sub/script/utils/name_validation.py
index d1dd1488..de187ec8 100644
--- a/src/ytdl_sub/script/utils/name_validation.py
+++ b/src/ytdl_sub/script/utils/name_validation.py
@@ -42,6 +42,8 @@ def validate_custom_function_name(custom_function_name: str) -> None:
     """
     Raises
     ------
+    InvalidFunctionName
+        If the function name is invalid
     InvalidVariableName
         if the variable name is invalid
     """
diff --git a/src/ytdl_sub/utils/chapters.py b/src/ytdl_sub/utils/chapters.py
index eaec744f..1eacc5b8 100644
--- a/src/ytdl_sub/utils/chapters.py
+++ b/src/ytdl_sub/utils/chapters.py
@@ -238,6 +238,9 @@ class Chapters:
 
     @classmethod
     def from_yt_dlp_chapters(cls, chapters: List[Dict[str, str | float]]):
+        """
+        Create a Chapters object from the raw ``chapters`` metadata returned in an info.json
+        """
         timestamps: List[Timestamp] = []
         titles: List[str] = []
 
diff --git a/src/ytdl_sub/utils/script.py b/src/ytdl_sub/utils/script.py
index 5784850a..a50e8e7a 100644
--- a/src/ytdl_sub/utils/script.py
+++ b/src/ytdl_sub/utils/script.py
@@ -5,15 +5,6 @@ from typing import Iterable
 
 
 class ScriptUtils:
-    @classmethod
-    def add_dummy_variables(cls, variables: Iterable[str]) -> Dict[str, str]:
-        dummy_variables: Dict[str, str] = {}
-        for var in variables:
-            dummy_variables[var] = ""
-            dummy_variables[f"{var}_sanitized"] = ""
-
-        return dummy_variables
-
     @classmethod
     def add_sanitized_variables(cls, variables: Dict[str, str]) -> Dict[str, str]:
         sanitized_variables = {
diff --git a/src/ytdl_sub/validators/string_datetime.py b/src/ytdl_sub/validators/string_datetime.py
index b28c62d7..d50be211 100644
--- a/src/ytdl_sub/validators/string_datetime.py
+++ b/src/ytdl_sub/validators/string_datetime.py
@@ -1,5 +1,3 @@
-from typing import Dict
-
 from yt_dlp.utils import datetime_from_str
 
 from ytdl_sub.validators.string_formatter_validators import OverridesStringFormatterValidator